Change way celery is working

[jrmi]

To enable using celery in the main project

[codecov]

Codecov Report

Merging #13 into master will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
- Coverage   93.58%   93.52%   -0.06%     
==========================================
  Files          17       16       -1     
  Lines         655      649       -6     
==========================================
- Hits          613      607       -6     
  Misses         42       42              

Impacted Files	Coverage Δ
django_geosource/app_settings.py	100.00% <ø> (ø)
django_geosource/geostore_callbacks.py	96.55% <ø> (ø)
...eosource/management/commands/resync_all_sources.py	94.73% <ø> (ø)
...ngo_geosource/management/commands/resync_source.py	100.00% <ø> (ø)
django_geosource/parsers.py	33.33% <ø> (ø)
django_geosource/tasks.py	96.42% <ø> (ø)
django_geosource/mixins.py	100.00% <100.00%> (ø)
django_geosource/models.py	99.09% <100.00%> (-0.01%)	⬇️
django_geosource/schedulers.py	91.11% <100.00%> (ø)
django_geosource/serializers.py	88.46% <100.00%> (ø)
... and 1 more

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